What is the percent composition of NiO if a sample of NiO with a mass of 41.9grams contains 33.1 g Ni and 8.8 O

Percent composition can be solve by:

(mass desired component) / mass sample * 100

% Nitrogen of the sample NiO can be solved:

%Ni = (33.1 g Ni / 41.9 g NiO) x 100

%Ni = 79% Ni

% oxgen:

%O = (8.8 g O / 41.9 g NiO) x 100

%O = 21 % O